The station was fitted with a laser extension boom for the stations robot arm, now just because the extension was added and the station is “officially” completed it does not mean that they are going to continue adding additional expansions.
The Russians are still planning to add another science module in 2012 called Nauka which will be the last major component to the station. Additional modules are going to be added in the future, including the Bigelow and the inflatable habitats, and of course in the future they are adding the VASIMIR Thrusters to keep the ISS at a steady altitude.
Now that the Station is completed, I guess other nations, and private companies can add additional modules to make an actual station, while the ISS is an amazing piece of technology, is not something that can sustain humans for an extended period of times, even if it could, the station is full of sensitive cables that can destroy it like the ones in the movies.
Via: Yahoo